In previous campaigns (2011 and 2012) we also observed a separation of treatments from control plots (although marginally significant), with no clear separation within the different drought treatments of 1, 2, 3, 4 and 5 years of recurrent droughts (Supplementary Fig. 14 , bottom graphs).
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Ecological memory of recurrent drought modifies soil processes via changes in soil microbial community.
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We also found that AMF showed a trend in decreasing biomass in response to drought, similar to previous studies 42 , but without any change in composition in single drought 42 – 44 , whereas a clear shift was visible after 10 years of recurrent drought.